/* ==========================================================================
   CRYPTID TAXONOMY & FIELD METHODOLOGY - STYLESHEET
   Aesthetic: Dark Academia Library / High-End Academic Compendium
   ========================================================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;600;700;900&family=Lora:ital,wght@0,400;0,500;0,600;1,400&family=Montserrat:wght@300;400;500;600&display=swap');

:root {
    /* Color Palette */
    --bg-darker: #0d0f13;
    --bg-dark: #161920;
    --bg-card: #1f242e;
    --bg-card-hover: #262c39;
    
    --text-primary: #f5f2eb;
    --text-secondary: #c9c3b5;
    --text-muted: #8e897e;
    
    --accent-gold: #c5a880;
    --accent-gold-hover: #e0c29b;
    --accent-gold-glow: rgba(197, 168, 128, 0.25);
    
    --accent-red: #8e3a43;
    --accent-red-hover: #ab4752;
    --accent-green: #3f6e52;
    --accent-green-hover: #508a67;
    
    --border-color: #383e4c;
    --border-gold: #8d7657;
    
    /* Typography */
    --font-header: 'Cinzel', serif;
    --font-body: 'Lora', serif;
    --font-ui: 'Montserrat', sans-serif;
    
    /* Transitions */
    --transition-speed: 0.3s;
    --border-radius: 8px;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    --gold-shadow: 0 0 15px rgba(197, 168, 128, 0.15);
}

/* Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-darker);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.7;
    font-size: 17px;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 50% 30%, rgba(31, 36, 46, 0.4) 0%, transparent 70%),
        linear-gradient(rgba(13, 15, 19, 0.95), rgba(13, 15, 19, 0.95));
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-darker);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-gold);
}

/* Header & Navigation */
header {
    background-color: var(--bg-dark);
    border-bottom: 2px solid var(--border-gold);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.logo-container {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-family: var(--font-header);
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--accent-gold);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.logo-subtitle {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 4px;
    color: var(--text-muted);
}

nav {
    display: flex;
    gap: 1.5rem;
}

.nav-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    padding: 0.6rem 1.2rem;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    border-radius: var(--border-radius);
}

.nav-btn:hover {
    color: var(--accent-gold);
    background-color: rgba(197, 168, 128, 0.05);
    border-color: rgba(197, 168, 128, 0.3);
}

.nav-btn.active {
    color: var(--bg-darker);
    background-color: var(--accent-gold);
    border-color: var(--accent-gold);
    font-weight: 600;
    box-shadow: var(--gold-shadow);
}

/* Main Container Layout */
main {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem 4rem 2rem;
    min-height: calc(100vh - 180px);
}

/* Page Section Wrappers */
.page-section {
    display: none;
    animation: fadeIn var(--transition-speed) ease-in-out forwards;
}

.page-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Elegant Text Elements & Cards */
h1, h2, h3, h4 {
    font-family: var(--font-header);
    color: var(--accent-gold);
    margin-bottom: 1.5rem;
}

h1 {
    font-size: 2.8rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.8rem;
    text-align: center;
}

h2 {
    font-size: 2rem;
    position: relative;
    padding-bottom: 0.5rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 2px;
    background-color: var(--accent-gold);
}

p {
    margin-bottom: 1.2rem;
    text-align: justify;
}

/* TEXTBOOK MODULE (Double Column Book Layout) */
.textbook-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.textbook-sidebar {
    background-color: rgba(13, 15, 19, 0.5);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem;
}

.textbook-sidebar h3 {
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.syllabus-list {
    list-style: none;
}

.syllabus-item {
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    border-radius: 4px;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    border-left: 2px solid transparent;
}

.syllabus-item:hover {
    background-color: rgba(197, 168, 128, 0.05);
    color: var(--accent-gold);
    padding-left: 1.25rem;
}

.syllabus-item.active {
    background-color: rgba(197, 168, 128, 0.1);
    color: var(--accent-gold);
    border-left-color: var(--accent-gold);
    font-weight: 500;
}

.textbook-content {
    padding: 3rem;
    max-height: 75vh;
    overflow-y: auto;
}

.book-page {
    max-width: 800px;
    margin: 0 auto;
}

.book-chapter-num {
    font-family: var(--font-ui);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 3px;
    color: var(--accent-gold);
    margin-bottom: 0.5rem;
    display: block;
}

.academic-note {
    background-color: rgba(197, 168, 128, 0.05);
    border-left: 3px solid var(--accent-gold);
    padding: 1.25rem;
    margin: 2rem 0;
    font-style: italic;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* CODEX MODULE (Cryptid Database) */
.codex-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    background-color: var(--bg-dark);
    padding: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.search-input {
    flex: 1;
    min-width: 250px;
    background-color: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: var(--font-ui);
    font-size: 0.95rem;
    transition: border-color var(--transition-speed);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-gold);
}

.filter-select {
    background-color: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: var(--font-ui);
    font-size: 0.95rem;
    cursor: pointer;
    min-width: 150px;
    outline: none;
}

.filter-select:focus {
    border-color: var(--accent-gold);
}

.codex-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.cryptid-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
    box-shadow: var(--box-shadow);
}

.cryptid-card:hover {
    transform: translateY(-8px);
    background-color: var(--bg-card-hover);
    border-color: var(--accent-gold);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.7), var(--gold-shadow);
}

.cryptid-img-container {
    height: 220px;
    background-color: var(--bg-darker);
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
}

.cryptid-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
    filter: sepia(0.3) contrast(1.1) brightness(0.85);
}

.cryptid-card:hover img {
    transform: scale(1.05);
    filter: sepia(0.1) contrast(1.1) brightness(0.95);
}

.cryptid-tag {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: rgba(13, 15, 19, 0.85);
    border: 1px solid var(--border-gold);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-family: var(--font-ui);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-gold);
}

.cryptid-info {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.cryptid-name {
    font-family: var(--font-header);
    font-size: 1.3rem;
    color: var(--accent-gold);
    margin-bottom: 0.25rem;
}

.cryptid-scientific {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.cryptid-summary {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 1rem;
    text-align: left;
}

.cryptid-meta {
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    padding-top: 0.8rem;
    display: flex;
    justify-content: space-between;
    font-family: var(--font-ui);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Modal Details View */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(13, 15, 19, 0.9);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed) ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-container {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-gold);
    border-radius: var(--border-radius);
    max-width: 900px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8), 0 0 30px rgba(197, 168, 128, 0.1);
    transform: scale(0.9);
    transition: transform var(--transition-speed) cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
}

.modal-overlay.active .modal-container {
    transform: scale(1);
}

.modal-close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: rgba(0,0,0,0.5);
    border: 1px solid var(--border-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    z-index: 10;
}

.modal-close-btn:hover {
    color: var(--accent-gold);
    border-color: var(--accent-gold);
    background-color: var(--bg-darker);
}

.modal-hero {
    height: 350px;
    position: relative;
    background-color: var(--bg-darker);
}

.modal-hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: sepia(0.2) contrast(1.1) brightness(0.75);
}

.modal-hero-title {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 2rem;
    background: linear-gradient(to top, rgba(22, 25, 32, 1) 0%, rgba(22, 25, 32, 0.5) 60%, transparent 100%);
}

.modal-hero-title h2 {
    font-size: 2.2rem;
    margin-bottom: 0.2rem;
}

.modal-hero-title h2::after {
    display: none;
}

.modal-body {
    padding: 2.5rem;
}

.modal-data-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2rem;
    font-family: var(--font-ui);
    font-size: 0.9rem;
}

.modal-data-table th, .modal-data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.modal-data-table th {
    font-weight: 600;
    color: var(--accent-gold);
    width: 30%;
}

.modal-desc-heading {
    font-family: var(--font-header);
    color: var(--accent-gold);
    font-size: 1.25rem;
    margin-bottom: 0.8rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3rem;
}

/* SIGHTING MAP MODULE */
.map-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
    height: 600px;
}

.map-container {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
}

.map-svg {
    width: 100%;
    height: 100%;
    background-color: #11141b;
}

.map-land {
    fill: #222a36;
    stroke: #0d1218;
    stroke-width: 0.5;
}

.map-grid-lines {
    stroke: rgba(197, 168, 128, 0.04);
    stroke-width: 0.5;
}

.map-pin {
    fill: var(--accent-gold);
    stroke: var(--bg-darker);
    stroke-width: 1;
    cursor: pointer;
    transition: all 0.2s ease;
}

.map-pin:hover {
    fill: var(--accent-red-hover);
    r: 7;
    filter: drop-shadow(0 0 5px var(--accent-red-hover));
}

.map-pin.active {
    fill: var(--accent-red);
    r: 8;
    filter: drop-shadow(0 0 8px var(--accent-red));
}

.map-details-sidebar {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    box-shadow: var(--box-shadow);
}

.map-sidebar-title {
    font-family: var(--font-header);
    color: var(--accent-gold);
    font-size: 1.2rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--border-gold);
    padding-bottom: 0.5rem;
}

.map-sidebar-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.map-sidebar-placeholder {
    color: var(--text-muted);
    font-family: var(--font-ui);
    font-size: 0.9rem;
}

.map-detail-card {
    text-align: left;
    width: 100%;
    animation: fadeIn var(--transition-speed) ease-in-out;
}

.map-detail-cryptid {
    font-family: var(--font-header);
    color: var(--accent-gold);
    font-size: 1.4rem;
    margin-bottom: 0.25rem;
}

.map-detail-loc {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.map-detail-spec {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.map-detail-meta-row {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.map-detail-meta-row strong {
    color: var(--text-secondary);
}

/* FIELD LABORATORY MODULE */
.lab-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 2rem;
    min-height: 600px;
}

.lab-nav {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    box-shadow: var(--box-shadow);
}

.lab-nav-title {
    font-family: var(--font-ui);
    text-transform: uppercase;
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.lab-tab-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.8rem 1rem;
    border-radius: 4px;
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
}

.lab-tab-btn:hover {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
    background-color: rgba(197, 168, 128, 0.02);
}

.lab-tab-btn.active {
    background-color: var(--accent-gold);
    border-color: var(--accent-gold);
    color: var(--bg-darker);
    font-weight: 600;
}

.lab-content {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    box-shadow: var(--box-shadow);
    position: relative;
    display: flex;
    flex-direction: column;
}

.lab-panel {
    display: none;
    flex-direction: column;
    flex-grow: 1;
    animation: fadeIn var(--transition-speed) ease;
}

.lab-panel.active {
    display: flex;
}

/* Simulator Sub-Components */
/* 1. Footprint Cast simulator */
.footprint-sim-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.footprint-sandbox {
    width: 100%;
    max-width: 450px;
    height: 400px;
    background-color: #2b221a; /* earthy soil color */
    border: 4px solid #1a1410;
    border-radius: 8px;
    position: relative;
    cursor: grab;
    overflow: hidden;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.8);
}

.footprint-cast-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
    opacity: 0.05; /* Barely visible under soil */
    transition: opacity 0.5s ease;
}

.footprint-dirt-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, #3e3226 0%, #2b221a 100%);
    pointer-events: none;
}

.dirt-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

.lab-tool-instructions {
    background-color: rgba(197,168,128,0.05);
    border: 1px dashed var(--accent-gold);
    border-radius: 4px;
    padding: 1rem;
    width: 100%;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    text-align: center;
}

.brush-progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--bg-darker);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 1rem;
}

.brush-progress-fill {
    width: 0%;
    height: 100%;
    background-color: var(--accent-gold);
    transition: width 0.1s ease;
}

/* 2. Spectrogram Simulator */
.spectrogram-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.spectrogram-display {
    width: 100%;
    height: 200px;
    background-color: #080a0f;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.spectrogram-wave-bar {
    position: absolute;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to top, var(--accent-green) 0%, var(--accent-gold) 60%, var(--accent-red) 100%);
    opacity: 0.7;
}

.frequency-slider-container {
    background-color: var(--bg-card);
    padding: 1.5rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.slider-row {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.slider-label {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.lab-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-darker);
    outline: none;
}

.lab-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-gold);
    cursor: pointer;
    box-shadow: 0 0 5px rgba(197, 168, 128, 0.5);
    transition: transform 0.1s;
}

.lab-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.play-audio-btn {
    background-color: var(--accent-gold);
    color: var(--bg-darker);
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    border-radius: 4px;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    align-self: center;
}

.play-audio-btn:hover {
    background-color: var(--accent-gold-hover);
    box-shadow: var(--gold-shadow);
}

/* 3. Microscope Simulator */
.microscope-container {
    display: flex;
    gap: 2rem;
    align-items: center;
    flex-wrap: wrap;
}

.microscope-viewport {
    width: 320px;
    height: 320px;
    border-radius: 50%;
    border: 8px solid #333;
    outline: 4px solid var(--border-color);
    background-color: #000;
    overflow: hidden;
    position: relative;
    box-shadow: 0 10px 40px rgba(0,0,0,0.8), inset 0 0 40px rgba(0,0,0,1);
    margin: 0 auto;
}

.microscope-lens-effect {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    box-shadow: inset 0 0 50px rgba(0,0,0,0.9);
    pointer-events: none;
    z-index: 5;
}

.microscope-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: blur(15px); /* Adjusted by JS */
    transition: filter 0.1s ease;
    opacity: 0.85;
}

.microscope-controls {
    flex: 1;
    min-width: 250px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Laboratory Analysis Results Card */
.lab-analysis-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.5rem;
    margin-top: 1.5rem;
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.lab-analysis-card.active {
    display: block;
}

/* EXAM MODULE */
.exam-intro {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 3rem auto;
}

.primary-btn {
    background-color: var(--accent-gold);
    color: var(--bg-darker);
    border: 1px solid var(--border-gold);
    padding: 1rem 2rem;
    font-family: var(--font-ui);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    margin-top: 1.5rem;
    box-shadow: var(--gold-shadow);
}

.primary-btn:hover {
    background-color: var(--accent-gold-hover);
    box-shadow: 0 0 20px rgba(197, 168, 128, 0.4);
}

.exam-quiz-container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem;
    box-shadow: var(--box-shadow);
    display: none;
}

.quiz-progress-bar {
    width: 100%;
    height: 4px;
    background-color: var(--bg-darker);
    margin-bottom: 2.5rem;
    border-radius: 2px;
    overflow: hidden;
}

.quiz-progress-fill {
    width: 10%;
    height: 100%;
    background-color: var(--accent-gold);
    transition: width 0.3s ease;
}

.quiz-question {
    font-family: var(--font-header);
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.quiz-option-label {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    font-family: var(--font-ui);
    font-size: 0.95rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.quiz-option-label:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--accent-gold);
}

.quiz-option-label.selected {
    border-color: var(--accent-gold);
    background-color: rgba(197, 168, 128, 0.08);
}

.quiz-option-radio {
    accent-color: var(--accent-gold);
    width: 18px;
    height: 18px;
}

.quiz-nav-row {
    display: flex;
    justify-content: space-between;
}

.secondary-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.8rem 1.5rem;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.secondary-btn:hover:not(:disabled) {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
}

.secondary-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Exam Results & Certificate Panel */
.exam-results-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    display: none;
    animation: fadeIn 0.5s ease forwards;
}

.results-score-big {
    font-size: 4rem;
    font-family: var(--font-header);
    color: var(--accent-gold);
    margin: 1.5rem 0;
    text-shadow: 0 0 20px rgba(197, 168, 128, 0.3);
}

.certificate-card {
    background-color: #f7f5ef; /* vintage canvas paper color */
    border: 12px double #8d7657;
    outline: 2px solid #5a4b37;
    outline-offset: -8px;
    padding: 3rem;
    margin: 3rem auto;
    color: #2b2319; /* dark brown ink */
    max-width: 650px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
    position: relative;
    background-image: 
        radial-gradient(circle at 10% 10%, rgba(141, 118, 87, 0.03) 0%, transparent 80%),
        radial-gradient(circle at 90% 90%, rgba(141, 118, 87, 0.03) 0%, transparent 80%);
}

.cert-header {
    font-family: var(--font-header);
    font-size: 1.1rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: #5a4b37;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.cert-title {
    font-family: var(--font-header);
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: #2b2319;
}

.cert-statement {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.cert-name {
    font-family: var(--font-header);
    font-size: 2rem;
    border-bottom: 1px solid #c5a880;
    display: inline-block;
    padding: 0 2rem 0.5rem 2rem;
    margin-bottom: 2rem;
    font-weight: 900;
}

.cert-seal {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 3px double #8d7657;
    background-color: #d4b285;
    margin: 2rem auto 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-header);
    font-size: 0.65rem;
    font-weight: bold;
    color: #5a4b37;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

/* HIDDEN CANVAS FOR DOWNLOAD */
#cert-canvas {
    display: none;
}

/* Footer Section */
footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-darker);
    padding: 3rem 2rem;
    text-align: center;
    margin-top: 4rem;
}

.footer-logo {
    font-family: var(--font-header);
    color: var(--accent-gold);
    font-size: 1.2rem;
    letter-spacing: 1.5px;
    margin-bottom: 0.5rem;
}

.footer-text {
    font-family: var(--font-ui);
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Responsive Rules */
@media (max-width: 1024px) {
    .textbook-layout {
        grid-template-columns: 1fr;
    }
    
    .textbook-sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .textbook-content {
        padding: 2rem;
    }
    
    .map-layout {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .map-container {
        height: 450px;
    }
    
    .map-details-sidebar {
        height: 250px;
    }
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    
    nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .lab-layout {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 2.2rem;
    }
    
    h2 {
        font-size: 1.6rem;
    }
    
    .microscope-viewport {
        width: 260px;
        height: 260px;
    }
}

/* ==========================================================================
   TEXTBOOK PAGINATION BAR STYLES
   ========================================================================== */
.book-pagination-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: rgba(13, 15, 19, 0.4);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    font-family: var(--font-ui);
    font-size: 0.85rem;
}

.pag-select-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.pag-select-container select {
    background-color: var(--bg-darker);
    border: 1px solid var(--border-gold);
    color: var(--accent-gold);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    outline: none;
    cursor: pointer;
    font-family: var(--font-ui);
    font-weight: 600;
}

.pag-btn {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    margin: 0;
}

.pag-indicator {
    color: var(--text-muted);
    font-family: var(--font-ui);
    font-size: 0.85rem;
}

/* ==========================================================================
   SKEUOMORPHIC DESK AND BOOK LAYOUT
   ========================================================================== */
.desk-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    background: radial-gradient(circle at 50% 50%, #2a1b14 0%, #150f0c 100%);
    border: 8px solid #0f0b09;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: inset 0 0 100px rgba(0,0,0,0.8), 0 20px 50px rgba(0,0,0,0.6);
    position: relative;
    overflow: hidden;
}

.ledger-sidebar {
    background-color: rgba(22, 25, 32, 0.95);
    border: 1px solid var(--border-color);
    border-left: 5px solid var(--accent-gold);
    box-shadow: 5px 5px 15px rgba(0,0,0,0.5);
    height: fit-content;
}

.book-workspace {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.skeuo-book {
    width: 100%;
    max-width: 900px;
    height: 600px;
    position: relative;
    perspective: 1500px;
    border-radius: 8px;
    box-shadow: 0 25px 55px rgba(0,0,0,0.7);
}

/* Book Cover Panel */
.book-cover {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #382419 0%, #1c120c 100%);
    color: var(--accent-gold);
    border: 12px solid #231610;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 10;
    box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.8), 0 10px 30px rgba(0,0,0,0.5);
    transition: transform 0.8s ease-in-out, opacity 0.5s ease;
    transform-origin: left center;
}

.book-cover.open {
    transform: rotateY(-130deg);
    opacity: 0;
    pointer-events: none;
}

.cover-gold-border {
    border: 2px double var(--accent-gold);
    padding: 3rem 2rem;
    width: 90%;
    height: 90%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.cover-institute {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.cover-main-title {
    font-family: var(--font-header);
    font-size: 3rem;
    font-weight: 900;
    letter-spacing: 2px;
    text-shadow: 0 4px 6px rgba(0,0,0,0.6);
    color: var(--accent-gold);
}

.cover-sub-title {
    font-family: var(--font-header);
    font-size: 1.5rem;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.cover-author {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-gold);
    margin-bottom: 2.5rem;
    line-height: 1.5;
}

.cover-seal-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    border: 2px solid var(--accent-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-header);
    font-size: 0.85rem;
    font-weight: bold;
}

/* Open Book Spread Panel */
.book-pages-panel {
    width: 100%;
    height: 100%;
    display: flex;
    position: relative;
    background-color: #231610; /* outer cover edge */
    border-radius: 8px;
    border: 8px solid #231610;
    box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    animation: openBookSpread 0.6s ease-out forwards;
}

@keyframes openBookSpread {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.book-page-spread {
    width: 50%;
    height: 100%;
    padding: 2rem 2.5rem;
    display: flex;
    flex-direction: column;
    background-color: #fbf6ec; /* Cream paper */
    cursor: pointer;
    position: relative;
    user-select: none;
}

.left-page-spread {
    background-image: linear-gradient(to right, #fcf8f2 92%, #efe6d9 100%);
    border-top-left-radius: 4px;
    border-bottom-left-radius: 4px;
    box-shadow: -5px 0 10px rgba(0,0,0,0.2) inset;
}

.right-page-spread {
    background-image: linear-gradient(to left, #fcf8f2 92%, #efe6d9 100%);
    border-top-right-radius: 4px;
    border-bottom-right-radius: 4px;
    box-shadow: 5px 0 10px rgba(0,0,0,0.2) inset;
}

.book-spine-crease {
    position: absolute;
    top: 0;
    left: 50%;
    width: 24px;
    height: 100%;
    transform: translateX(-50%);
    background: linear-gradient(to right, rgba(0,0,0,0.15) 0%, rgba(0,0,0,0.4) 50%, rgba(0,0,0,0.15) 100%);
    z-index: 5;
    pointer-events: none;
}

/* Page Header & Footer */
.page-header-row {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    color: #8d7657;
    text-transform: uppercase;
    letter-spacing: 2px;
    border-bottom: 1px solid rgba(141, 118, 87, 0.15);
    padding-bottom: 0.4rem;
    margin-bottom: 1.2rem;
}

.page-footer-row {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    color: #8d7657;
    border-top: 1px solid rgba(141, 118, 87, 0.15);
    padding-top: 0.4rem;
    margin-top: auto;
}

.page-number-display {
    font-weight: 600;
}

.page-spread-content {
    flex-grow: 1;
    overflow-y: auto;
    font-family: var(--font-body);
    font-size: 0.88rem;
    color: #2b2319;
    line-height: 1.7;
    padding-right: 0.5rem;
}

.page-spread-content p {
    color: #2b2319;
    text-align: justify;
    margin-bottom: 1rem;
    text-indent: 1.5rem;
}

.page-spread-content p:first-of-type {
    text-indent: 0;
}

.page-spread-content h2, .page-spread-content h3, .page-spread-content h4 {
    color: #5a4b37;
    font-family: var(--font-header);
    margin-top: 1.2rem;
    margin-bottom: 0.6rem;
    border: none;
    padding: 0;
    text-align: left;
}

.page-spread-content h2 { font-size: 1.2rem; border-bottom: 1px dashed rgba(141,118,87,0.3); padding-bottom:0.2rem;}
.page-spread-content h3 { font-size: 1.05rem; }

.page-spread-content .academic-note {
    background-color: rgba(141, 118, 87, 0.05);
    border-left: 3px solid #8d7657;
    padding: 0.8rem 1rem;
    margin: 1rem 0;
    font-size: 0.82rem;
    line-height: 1.5;
    color: #5a4b37;
}

/* Table of Contents Formatting */
.toc-list {
    list-style: none;
    margin-top: 1.5rem;
}

.toc-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.8rem;
    font-family: var(--font-ui);
    font-size: 0.8rem;
    cursor: pointer;
    color: #2b2319;
    transition: color 0.2s;
}

.toc-row:hover {
    color: #8d7657;
}

.toc-dots {
    flex-grow: 1;
    border-bottom: 1px dotted rgba(141, 118, 87, 0.4);
    margin: 0 0.5rem;
}

.toc-page-num {
    font-weight: bold;
}

/* Drop-Caps */
.page-drop-cap::first-letter {
    font-family: var(--font-header);
    font-size: 3rem;
    float: left;
    line-height: 0.8;
    margin-right: 0.4rem;
    margin-top: 0.15rem;
    color: #8d7657;
    font-weight: 700;
    border: 1px solid rgba(141, 118, 87, 0.3);
    padding: 2px 6px;
    background-color: rgba(141, 118, 87, 0.03);
}

.book-bottom-info {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    color: rgba(197, 168, 128, 0.5);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 0.5rem;
}

/* Responsive Book Spread overrides */
@media (max-width: 1024px) {
    .desk-container {
        grid-template-columns: 1fr;
        padding: 1rem;
    }
}

@media (max-width: 768px) {
    .skeuo-book {
        height: auto;
        min-height: 500px;
    }
    .book-pages-panel {
        flex-direction: column;
        height: auto;
    }
    .book-page-spread {
        width: 100%;
        height: auto;
        padding: 1.5rem;
    }
    .left-page-spread {
        border-bottom: 1px dashed rgba(0,0,0,0.1);
        border-right: none;
    }
    .book-spine-crease {
        display: none;
    }
}

/* User Role Access Gate Pulse Animation */
@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.08); opacity: 0.75; }
    100% { transform: scale(1); opacity: 1; }
}